Looks ike this one has fallen prey to the curse of Google (and, yes, I was surprised by the answer too). So, here's a new one to bump the thread along:
Graeme Edge, Moody Blues
Graham Gouldman, 10cc
Mike Love, The Beach Boys
Simon Nicol, Fairport Convention
Rick Davies, Supertramp
All have something in common but one is also the odd one out for a closely related reason. Who and why?